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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc93f54f2ebf12f8e89de67f3d8c96b327ab145e59a2655d4b0db4de6143ba' 
  AND token = '/bcW5ejw6C+gsUDD/Nqv0gjVRgZ3CrIILPElXyRbZaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}